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## Homework Statement

A beam of red light has twice the intensity as a second bean of the same color. Calculate the ratio of the amplitude of wave.

## Homework Equations

[tex]intensity \propto (amplitude)^2[/tex]

## The Attempt at a Solution

[tex]1^{st} \mbox{ beam} = 2I[/tex]

[tex]2^{nd} \mbox{ beam} = I[/tex]

I don't know if this step is correct and I don't know what to do next?!